Hydroprocessing of biocomponent feedstocks with low purity hydrogen-containing streams

a biocomponent and stream technology, applied in the direction of hydrocarbon oil treatment products, biofuels, fuels, etc., can solve the problems of modifying and/or replacing low pressure units to allow for higher processing pressure, affecting the production of diesel fuel from biocomponent sources, and requiring expensive capital investmen

Active Publication Date: 2011-06-30
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]One aspect of the invention relates to a method for hydroprocessing a biocomponent feedstock to form a diesel boiling range product, comprising: treating a purge gas and / or an off-gas stream from an existing refinery reactor to remove hydrogen sulfide and carbon dioxide, the treated refinery stream having a hydrogen content from about 20 mol % to about 60 mol %, for example from about 25 mol % to about 50 mol %; and hydroprocessing a feedstock comprising a biocomponent portion in a reactor in the presence of the treated refinery stream, a catalyst with hydrogenation activity, and optionally steam under effective hydroprocessing conditions to produce a vapor effluent, an aqueous effluent, and the diesel boiling range product.
[0013]Another aspect of the invention relates to a method for hydroprocessing a biocomponent feedstock to form a diesel boiling range product, comprising: treating a purge gas and / or an off-gas stream from an existing refinery reactor to remove hydrogen sulfide and carbon dioxide, the treated refinery stream having a hydrogen content from about 25 wt % to about 50 wt %; and hydroprocessing a feedstock comprising a biocomponent portion in a reactor in the presence of the treated refinery stream, a catalyst with hydrogenation activity, and optionally steam under effective hydroprocessing conditions to produce a vapor effluent, an aqueous effluent, and the diesel boiling range product.

Problems solved by technology

Producing diesel fuel from biocomponent sources also presents a variety of challenges.
In particular, for diesel hydroprocessing units that operate at low pressures, the presence of the additional heteroatoms in a biocomponent based diesel feed may pose difficulties.
Modifying and / or replacing low pressure units to allow for higher processing pressures would require expensive capital investment.
Lower hydrogen pressures are mentioned as helping to reduce hydrogen consumption, but such pressures are mentioned as also leading to catalyst deactivation.

Method used

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  • Hydroprocessing of biocomponent feedstocks with low purity hydrogen-containing streams
  • Hydroprocessing of biocomponent feedstocks with low purity hydrogen-containing streams
  • Hydroprocessing of biocomponent feedstocks with low purity hydrogen-containing streams

Examples

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Effect test

example 1

[0117]A mineral ADO is hydrotreated to yield a product suitable for use in the diesel fuel pool, having a finished sulfur content of about 3 wppm or less and a finished nitrogen content of about 2 wppm or less, and exhibiting an API gravity of about 34.9 (degrees). About 70 wt % of this hydrotreated mineral ADO is added to about 30 wt % soybean oil to form a mixed feed. This mixed feed is contacted in a hydroprocessing reactor with a treat gas comprising about 40 mol % hydrogen and about 60 mol % methane in the presence of a commercial supported (alumina) NiMo hydrotreating catalyst at a temperature of about 625° F. (about 329° C.) and at a total reactor pressure of about 200 psig (about 1.4 MPag). The hydrotreating catalyst is not fresh and has been previously used to hydrotreat vacuum gas oils (VGO) to the extent that the catalyst has about a 10% activity reduction, as compared to fresh catalyst of identical composition. The treat gas is introduced at a rate of about 2250 scf / bbl ...

examples 2-4

[0119]A mixed feedstock, containing about 30 wt % of a biocomponent feed (soybean oil) and about 70 wt % of a mineral feed (bottoms from a hydrocracking unit), as described in Table 1 below, was hydrodeoxygenated in a pilot unit comprising a ˜100 cm3 HDO reactor loaded with an activated catalyst based on a commercially available supported NiMo catalyst. The HDO catalyst was activated using a DMDS spiked light gasoil. The HDO reactor EIT was thereafter brought to about 625° F. (about 329° C.), and the unit pressure was brought to between about 150 psig (about 1.0 MPag) and about 200 psig (about 1.4 MPag). This HDO reactor was run using a relatively low hydrogen content treat gas (˜40 mol % H2, with the remainder being methane) at a treat gas rate of about 2250 scf / bbl (about 380 Nm3 / m3), which corresponds to a hydrogen partial treat gas rate of about 900 scf / bbl (about 150 Nm3 / m3). The feed was run through the unit at an LHSV of between about 1.0 hr−1 and about 1.3 hr−1.

TABLE 1Base F...

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Abstract

A biocomponent feedstock can be hydroprocessed using a hydrogen-containing refinery as a source of hydrogen gas. A relatively low cost catalyst, such as a water gas shift catalyst and/or spent hydrotreating catalyst, can be used as a hydrogenation catalyst for the process. The hydroprocessing can allow for olefin saturation and/or deoxygenation of the biocomponent feed by using a relatively low value refinery stream, e.g., containing from about 20 mol % to about 60 mol % hydrogen.

Description

FIELD[0001]Systems and processes are provided for hydrotreatment of biocomponent feeds using a relatively low value refinery stream as a hydrogen source.BACKGROUND[0002]Fuels based on biocomponent sources will likely become increasingly prevalent in the future. Already, various governments have instituted current and future requirements that motor fuel pools contain a minimum percentage of fuel derived from a biocomponent source, such as a plant, animal, fish, or algae-based oil or fat.[0003]Producing diesel fuel from biocomponent sources also presents a variety of challenges. In particular, for diesel hydroprocessing units that operate at low pressures, the presence of the additional heteroatoms in a biocomponent based diesel feed may pose difficulties. Modifying and / or replacing low pressure units to allow for higher processing pressures would require expensive capital investment.[0004]For production of diesel fuel, vegetable oils such as canola oil, palm oil, or other similar oil...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G17/00
CPCC10G45/02C10G45/58C10L1/026Y02E50/13C10G2300/4018C10G2300/207C10G3/50C10G2300/701C10G2400/04C10G2300/1011C10G3/46Y02E50/10Y02P30/20
Inventor HANKS, PATRICK L.ELLIS, EDWARD S.
Owner EXXON RES & ENG CO
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